JPH0398973A - In-cage confinement detection device for elevator - Google Patents

Abstract

PURPOSE:To permit sure informing of abnormality to the outside without the operation of an emergency call button by providing an extreme infrared radiation sensor, detecting a heat ray generated from a human organism, and a means generating an abnormality signal after a given time passed within a cage. CONSTITUTION:An extreme infrared radiation sensor 10, detecting a heat ray generated from a human organism, and also an abnormality signal generating means, generating an in-cage confinement abnormality signal when a given time passed after the heat ray is detected with the above sensor 10, are provided at a suitable place in a cage 12. This constitution permits sure informing of abnormality to the outside with the whole area in the cage made a detectable area with one sensor 10, and even if the operation of an emergency call button can not be made with one baby confined.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a car trapping detection device for detecting that a passenger is trapped in an elevator car (prior art). As the use of electronics advances, the control functions of elevator control devices have become more sophisticated, and reliability has also improved significantly. However, even though the reliability of elevators has improved, this does not mean that all problems have been completely eliminated, and accidents such as passengers becoming trapped in elevator cars occasionally occur.

Conventionally, as a countermeasure against such a situation where the car is trapped, passengers have been asked to press an emergency call button or the like to contact the outside of the car, such as the caretaker's office, in order to rescue the passenger.

However, this method poses no problems as long as the caretaker is always on standby, but if the caretaker is absent, the caretaker's office cannot be contacted and rescue efforts may be delayed.

On the other hand, elevators have recently become commonplace even in small-scale residences, and children sometimes ride elevators alone. In such cases, even if the infant is trapped in the cage, the infant cannot operate the buttons on the operation panel, so the infant may be stuck in the cage for a long time.

Therefore, in order to solve the above-mentioned problem when the car is locked in, the car call button, door open button, or emergency call button is not operated at all even though there are passengers in the car.
A car confinement detection device has been proposed that generates an abnormal signal if the door remains closed and stopped for a predetermined period of time.

In this car confinement detection device, the presence of a passenger in the car is detected by deforming an elastic body such as a spring or rubber by the passenger's load, and operating a limit switch. Possible methods include installing an ultrasonic sensor on the ceiling to detect passengers, installing a photoelectric sensor on the side wall of the car to detect passengers, or using a load cell that can detect loads with high accuracy.

FIG. 4 shows an example in which an ultrasonic sensor is provided on the top of the car as means for detecting passengers in the car. That is,
In FIG. 4, reference numeral 12 denotes a car, and an operation panel 14 is provided on the side of a car door 13 located on the front side inside the car 12. Further, an ultrasonic sensor 20 is provided on the ceiling inside the car 12 in a detection area indicated by a dotted line in the figure.

(Problems to be Solved by the Invention) However, each of the detection means described above has the following problems.

First, methods that detect the presence of a passenger by operating a limit switch by deforming an elastic body such as a spring or rubber have poor detection accuracy and often do not operate under the load of one child. cannot perform its original functions.

Furthermore, in the method of detecting the presence of a passenger by installing an ultrasonic sensor 20 on the top of the car as shown in FIG. 4, the detection area of the ultrasonic sensor 20 is limited to the range shown by the dotted line in the figure. If not, it will malfunction due to irregularities near the side wall plate or car door 13.

Therefore, it is necessary to make the detection angle e as narrow as possible, and since the area from the floor surface to the height h is a non-detection area due to the detection of reflected waves, it may not be possible to detect small children or the like. Moreover, there is a drawback that the detection ability varies depending on the type of clothing the passenger is wearing.

Furthermore, the means for detecting the presence of passengers by installing ordinary photoelectric sensors on the side walls of the car has a thin beam-like detection area, so multiple sensors are required to detect a wide range. Reliability and
This is extremely disadvantageous in terms of cost and maintenance, and furthermore, the aesthetic appearance is impaired.

On the other hand, the method of detecting the presence of passengers using load cells is highly accurate because it detects the load based on the amount of distortion in the metal body, and the most practical method is to install multiple load cells under the floor. Therefore, a load signal adder, a signal amplification amplifier, etc. are required, which makes the configuration complicated, troublesome to maintain and adjust, and moreover expensive.

The present invention has a simple structure, low cost, and can detect the presence of a passenger in a car with high precision, and when a passenger is trapped in a car, it can be detected without having to operate an emergency call button or the like. We also aim to provide a highly reliable elevator car trap detection device that can reliably notify the outside world.
"Target."

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention creates a hole in the outside when it is detected that a passenger is trapped in the car of an elevator that is stopped with the doors closed. In an elevator car confinement detection device that outputs a normal signal, a far-infrared sensor is provided at an appropriate location in the car to detect heat rays emitted from a human body, and the far-infrared sensor detects the heat ray,
The apparatus also includes an abnormality signal generating means that starts counting on the condition that no operation button is operated in the car and generates a car confinement abnormality signal when a predetermined period of time has elapsed.

(Function) In the elevator car confinement detection device with this configuration, heat rays emitted from the human body are detected by far-infrared sensors installed at appropriate locations within the car, so one With this sensor, the entire area inside the car can be used as a detection area, and the presence or absence of passengers in the car can be detected with high accuracy regardless of the height, weight, type of clothing, or number of passengers. In addition, when the presence of a passenger in the car is detected by the far-infrared sensor, any operation button such as the car call button, door open button, emergency call button, etc. can be operated inside the stopped elevator car with the door closed. If a passenger is not locked in the car for a predetermined period of time, it is determined that a passenger is trapped in the car and an abnormal signal is output to the outside. This can be reliably notified to the outside.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1(a) and 1(b) respectively show the installation state of the far-infrared sensor in an embodiment of the elevator car confinement detection device according to the present invention; FIG. 1(a) is a view seen from the back of the hall; (b) is a side view. Figure 1 (a), (b)
), a far infrared sensor 10 is installed on the top of the car 12.
is mounted with the detection surface facing downward. This far-infrared sensor 10 is generally called a pyroelectric far-infrared sensor, and when far-infrared rays of around 10 μm emitted from the human body are focused and applied to a pyroelectric element, electric charges are induced due to temperature rise. However, this charge is extracted as a detection signal. Furthermore, a controller 11 is installed outside the ceiling of the car 12 to process the output signal of the far-infrared sensor 10 and output a detection signal. In addition, 13 is a car door, 14
is the control panel.

FIG. 2 is a circuit diagram showing an example of the structure of an elevator car confinement detection device. In FIG. 2, P and N are control power supply buses, and a controller 11 for processing the output signal of the far-infrared sensor 10 and a passenger detection relay 15 are connected in series between the power supply buses P and N. Ru. This passenger detection relay 15 operates when a detection signal is output from the controller 11. Further, between the power supply buses P and N, a normally closed contact 16b of a traveling relay (not shown) that operates when the elevator is operating, a normally open contact 17a of a door closing relay (not shown) that operates when the car door 13 is closed, and the passenger The normally open contact 15a of the detection relay 15, the normally closed contact 18b of the button operation detection relay, and one entrapment detection timer are connected in series. Although the button operation detection relay is not shown, it operates when any one of the car call button, door open button, and emergency call button is operated.

On the other hand, 19a is an output contact of a confinement detection timer 19 provided in the output circuit, and when the confinement detection timer 19 is excited and a predetermined period of time has elapsed, an abnormal signal is output to the outside by closing the output contact 19a. ing.

Next, the operation of the elevator car confinement detection device configured as described above will be described, taking as an example a case where an infant is trapped in the car 12 as shown in FIG. 1.

When a far-infrared sensor 10 installed on the ceiling of the car 2 detects heat rays emitted from the human body, its output signal is sent to a controller 11. This controller 11 processes the output signal of the far infrared sensor 10 and outputs a detection signal if a predetermined input is received within the detection area. In this case, the detection area of the far infrared sensor 10 is el as shown by the dotted line in FIG.
The angle is +82, and the three-dimensional shape is a square pyramid, so passengers inside the car can be almost completely detected.

When a detection signal is output from the controller 11, the passenger detection relay 15 operates to close the normally open contact 15a. now,
When the elevator is stopped and the car door 13 remains closed, and none of the car call button, door open button, or emergency call button on the operation panel 14 is operated, the normally closed contacts 16b118b and the normally open contacts 17a are all in a closed state. Therefore, one confinement detection timer is energized by forming an energizing path through the contacts of the power supply buses P and H. The one entrapment detection timer starts counting and operates after a predetermined period of time, for example, 30 seconds, and its output contact 19a closes. As a result, an abnormality signal is outputted from the output circuit to the outside of the elevator, such as a manager's room or a maintenance company.

In this way, in this embodiment, the far infrared sensor 10 that detects heat rays emitted from the human body is attached to the top of the car 12, so the entire area inside the car can be used as a detection area.
The presence of passengers in the car can be detected with high accuracy regardless of the height, weight, posture, type of clothing, position, and number of passengers. In other words, when detecting the presence of a passenger in a car using the ultrasonic sensor 20 as shown in FIG. Since the sensor does not emit energy itself, but instead detects the energy radiated from the human body, there is no need to consider the effects of reflection, etc., and it is suitable as a sensor installed inside a car.

In addition, even if the car stops due to an elevator malfunction, if the door remains closed, in other words, if the car becomes trapped, it is possible that there are passengers inside the car even if the buttons on the control panel cannot be operated. When a predetermined period of time has elapsed after detection, a malfunction signal is automatically output to the outside, so if the child is short, such as an infant, and cannot operate the buttons, or if the person is disabled or elderly, and cannot operate the buttons properly. Even if the inside of the car becomes dark due to a power outage or the like and buttons cannot be operated, the so-called jammed state can be reliably notified to the outside.

In the above embodiment, the case where the far infrared sensor 10 is installed on the top of the car 12 has been described, but if a lighting fixture or the like gets in the way, as shown in FIG.
The far-infrared sensor 10 may be attached to the back wall surface of the inside. In addition, the far infrared sensor 10 may be placed not only on the back wall of the car 12 but also on the side wall, the front, the operation panel, etc.
You may also install it. Furthermore, although the above embodiment shows a case in which one far-infrared sensor 10 is provided, a plurality of far-infrared sensors 10 may be provided for a store cart with a detection range such as a large cart. Good too.

Further, in the above embodiment, the abnormal signal generating means is configured by a relay sequence, but it may be configured by a logic circuit to provide the same function as described above.

[Effects of the Invention] As described above, according to the present invention, the heat rays emitted from the human body are detected by far-infrared sensors provided at appropriate locations within the car, so the structure is simple and inexpensive. The presence of passengers in the car can be detected with high accuracy, and if a passenger is trapped in the car, this can be reliably notified to the outside without the need to operate an emergency call button or other buttons. A highly reliable elevator car entrapment detection device can be provided.

[Brief explanation of drawings]

Figure 1(a). (b) shows the installation state of the far infrared sensor in one embodiment of the elevator car confinement detection device according to the present invention, (a) is a view seen from the back of the hall, (b) is a side view, and FIG. is a circuit diagram of the same embodiment, FIG. 3 is a side view of the inside of the car showing how the far infrared sensor is installed in another embodiment of the present invention, and FIG. 4 is a side view of the inside of the car showing an example of conventional passenger detection means. It is a view seen from the back of the landing. 10, far infrared sensor, 11... controller, 12.
... Car, 13 ... Car door, 14 ... Operation panel, 15
... Passenger detection relay 15a... Normally open contact of passenger detection relay, 16b... Normally closed contact of traveling relay, 17a
... Normally open contact of the door closing relay, 18b... Normally closed contact of the button operation detection relay, 19... Entrapment detection timer,
19a...Output contact of the entrapment detection timer.

Claims (1)

[Claims] In an elevator car trapping detection device that outputs an abnormal signal to the outside when it detects that a passenger is trapped in a stopped elevator car with the door closed, A far-infrared sensor is provided to detect heat rays emitted from the human body, and counting is started on the condition that the far-infrared sensor detects heat rays and no operation button is operated in the car, and when a predetermined period of time has elapsed. What is claimed is: 1. An elevator car confinement detection device comprising: abnormal signal generating means for generating a car confinement abnormal signal.